:root {
    --primary-color: #007AFF;
    --bg-color: #ffffff;
    --text-color: #1d1d1f;
    --secondary-text: #86868b;
    --light-gray: #f5f5f7;
    --card-bg: #ffffff;
    --transition: all 0.3s ease;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 0;
    line-height: 1.6;
    scroll-behavior: smooth;
}

nav {
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1100px;
    margin: 0 auto;
    position: sticky;
    top: 0;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid var(--light-gray);
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary-color);
    text-decoration: none;
}

.lang-switcher button {
    background: var(--light-gray);
    border: 1px solid #ddd;
    padding: 6px 14px;
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: var(--transition);
}

.lang-switcher button.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 4rem 2rem;
}

.hero {
    text-align: center;
    padding: 8rem 0 4rem;
}

h1 {
    font-size: clamp(3rem, 8vw, 5rem);
    margin-bottom: 1.5rem;
    color: var(--text-color);
    letter-spacing: -1px;
}

.hero p {
    font-size: 1.4rem;
    color: var(--secondary-text);
    max-width: 750px;
    margin: 0 auto 3rem;
}

.btn {
    display: inline-block;
    padding: 18px 40px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    text-decoration: none;
    border-radius: 30px;
    transition: var(--transition);
    font-weight: 600;
    font-size: 1.2rem;
    box-shadow: 0 4px 15px rgba(0, 122, 255, 0.2);
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 122, 255, 0.4);
    background-color: #0066cc;
}

.play-store-badge {
    display: inline-block;
    text-decoration: none;
    transition: var(--transition);
    margin-top: 1rem;
}

.play-store-badge:hover {
    transform: scale(1.05);
}

.status-badge {
    display: inline-block;
    padding: 4px 12px;
    background: #e1e1e1;
    border-radius: 12px;
    font-size: 0.8rem;
    margin-bottom: 1rem;
}

.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2.5rem;
    margin: 6rem 0;
}

.feature-card {
    background: var(--light-gray);
    padding: 2.5rem;
    border-radius: 24px;
    transition: var(--transition);
    border: 1px solid transparent;
    text-align: left;
}

.feature-card:hover {
    background: white;
    border-color: var(--primary-color);
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(0,0,0,0.05);
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.feature-card p {
    color: var(--secondary-text);
    margin: 0;
    font-size: 1.1rem;
}

.screenshot-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.5rem;
    margin-top: 4rem;
    margin-bottom: 6rem;
}

.screenshot-gallery img {
    width: 100%;
    border-radius: 20px;
    border: 1px solid #ddd;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
    transition: var(--transition);
}

.screenshot-gallery img:hover {
    transform: scale(1.03);
    border-color: var(--primary-color);
}

.security-box {
    background: #1d1d1f;
    color: white;
    padding: 4rem;
    border-radius: 32px;
    text-align: center;
    margin: 6rem 0;
}

.security-box h2 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    color: white;
}

.security-box p {
    color: #a1a1a6;
    max-width: 800px;
    margin: 0 auto 2rem;
    font-size: 1.2rem;
}

footer {
    padding: 4rem 2rem;
    text-align: center;
    border-top: 1px solid var(--light-gray);
    font-size: 0.9rem;
    color: var(--secondary-text);
    margin-top: 4rem;
}

.footer-links {
    margin-bottom: 1.5rem;
    display: flex;
    justify-content: center;
    gap: 2.5rem;
}

.footer-links a {
    color: var(--secondary-text);
    text-decoration: none;
    transition: color 0.2s;
}

.footer-links a:hover {
    color: var(--primary-color);
}

@media (max-width: 768px) {
    h1 { font-size: 3rem; }
    .container { padding: 2rem 1rem; }
    .features { grid-template-columns: 1fr; }
    nav { padding: 1rem; }
}